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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '548753e07558a026b2e614c3ffd865e84bde7b0279cf04453ad84880467cad8f' 
  AND token = 'Has++a06Z66wBfW3sX0Im9TOqU++iaTr2jNXAvSseus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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