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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3de925dddb8105d953707ab137310e4c5124a92e3c8374c0cefdac60e15a4d7' 
  AND token = 'M3sAgOM1WK/VfosMeUA231fC7ji5aoofqjN5vzvckcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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