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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '634840343489ca3fc7ee9cd771a629ba0a129d1f9889ce73fed6ee7867f64504' 
  AND token = 'gYbljzl9tKq94Tn6TWgkx9FM7+98H8q6ZW9+S4HDlsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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