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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3513be7186e18e2077e34d0f5fba87d21296a143dba5cc8248e94a27909025b' 
  AND token = 'FFNVV85NmAYAztkWBvlSy8dnCMuM0QM87Oj/q7h5J0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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