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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd792daffc6b2b74584d8a6ccefc4ce815ed9ed093f51d5f6145278a6ee8eefdc' 
  AND token = '33abkOMIE0slJBs16K7BxGGaBFM6P8hvH6Xsqv6cG2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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