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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6931cdf0d9de67b07d37edd2b6fd82418956bc47089d6ef7bb52ff31c162b7ef' 
  AND token = 'RWCadEOAAp6ONq0Y4jXmBFHtKzpa5GLb2AQ4RFv7RKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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