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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a8ab44d0d4cbb0c60df6dd29aec12109cf947c5b4d6168eeefa1aa9999b6eb' 
  AND token = 'JgSbxMr0w4eIu3aNXoZrp+4kXS8KjmKPIQx7qfzXG3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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