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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e30b13c94eee2ed3bdf7dded9e63765d2f1c53b4f1092b93ae7c43f3076076a9' 
  AND token = '4KRBzXyHodsTLpnLE3iPQm63CoVhuzW2hys2kGFuPQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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