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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c49590ff413a779935d365b82ec2b54e6d472276fd7d976a7ba04832596a764' 
  AND token = 'tXyH0ViQ72kh9wnxOeQ4DHb0TuASYuG0ovG7+LAxYT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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