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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70717cb7d47b790250fab9dd3d22933d2c7d92203152b8824914d7f5d90cb86' 
  AND token = 'm7XPyOYHqTHBEo2FttOK3PoaE2MQ+AHImb+lRJcBgFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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