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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbca90030130eff1394d97889684b3aa9e0c20202938e9aa37d7c068b87bb2a4' 
  AND token = 'xeqqf0HXS3da//QaQZ/zSAA3oqjGhTN5u+5q2diabYw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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