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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e509574db627f1a135eb4cf91c9d59109e00e1e7ed627980e1cb212acd8de397' 
  AND token = 'Y7dXrCAXERZiNbhJ4+OyzlHA3mf5EtPMpjC0gQkt+EU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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