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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '338e94e8e0e6dbe15343aa424cd5e9b9b079afb0f527a6e1786a5707b224c4cc' 
  AND token = 'uKLbo6/jMQmUMXq4ood4XnTNpt/Ml3+Ud/at4bLqXr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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