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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5273c7e72c8bf05d27281d325bfbb5774347c624f1214c918d19e1a36743ce0' 
  AND token = 'e3dSoI9Z79PQS3qWlCXKqysU5MgNy0QaKH7lgi9tqeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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