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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87d9315ebbb4c93423b6205118ba3b63877f79943a140548e23b48b836131a9' 
  AND token = 'PymJi3Z8YSB22jXg7Eivx99AIxXJA6qm6S1IEV50yBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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