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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a025bb46c02dd22f3d5c3d090dccf3755995413afe7365112981d150550e0d' 
  AND token = 'FcJ4KTez7gvwm9uAQJkN9k3J/jVDovIp8dz6YmPM1M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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