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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4c51960fbae36b0c236229b90ad53ebd09a1313f47d0874434bdcc677602838' 
  AND token = 'OkKUHKivHDiK0aAv5wlXn6SsJLUx+ogP5byWRI+Wtck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}