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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf59f329cf17aa1fb9b95ca2c3eb7abbfb1e7368517ecaace9803e3b9b817039' 
  AND token = '45aPHA6qQvyge57X8yV19JU9uEs6zEgk9bDO4RHzEUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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