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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '796a1aef57c51a083e93ca2fe9bf7fcea78d4f0f0ffffd9cb07e5c71597cea65' 
  AND token = 'Zuzxusk/2MiiFZVZRbUk54Jt+i5YDbmFMgAd2SFONy4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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