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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '850432932d442bddcf281097d69d1fc3543683757e1459e474c260a8e7d337e8' 
  AND token = 'RCGzaXP411r6jeIb9+gy+nNaeaFqXTj6QrWrHteYkz8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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