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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e69289e77dc05450785fc5ed6d41e498a178176e116c4fc8da4c68b58b6dc6c7' 
  AND token = 'd96K/aSm1BrqxLOxJmgGpwh2lwEeCiAKBlpVezeD/WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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