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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecbd2683373d6174d5ca8d55470118ec4371245b9b0d4d721020d39926d1967a' 
  AND token = 'f8AR/9VIVXROdKM5NoS0cHH9PMcKO17R+9Qln1aFy5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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