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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3105efdc74fb0d8be78e9d31b09614126dbfcba497d416a1ec5f0e8d8f28985' 
  AND token = 'cChBJvf0ehma5BfOzSom5Dmdofsc1i9DkpZUZ0yQ/oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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