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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09fa2dbd626f39b36aba3a1cad2caec145720a2fc606fb50b1cc2642d8463044' 
  AND token = 'A1BAS6pJHZs5z0u+KHcxy8qZSrZ8NfTiWo4dVV7wcfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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