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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9d0854c001961f24286f67081e891ecba5606af61ae0b24e95c0103c96c00c6' 
  AND token = 'xvnLqEUWy2M5kryMKNVS0GtbYyXK7MTULTY7IjTHH78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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