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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cba35a52ee4029a33405f806bba75048301b418f8460e5b98f3c6b95f90f7076' 
  AND token = 'EqDzy3xc0yR5SKq0t6NunZJKuEgsxg3S6w7QhKOdQ2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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