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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '345197f680a5dedc32147fa1ee90a680ff0465d88b2cc21e9be362d74c59ae76' 
  AND token = 'y/SLFfJr44+dboF0+GG7Ed2FRhsrROSTdzfs8nf4FUc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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