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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36236d3bff7b2f7ef49e0b9be09dc4499eafc6f0d38c89d512a05270cfee4f47' 
  AND token = 'eCCvkfjHL6kDf0K161uogypSXUXErJvV3bvcMYjNjuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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