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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f70ed783fa9f46eb815d1f7315a33ff957edb521cbebd0d50ad0a9281f82af66' 
  AND token = 'ZX9XrQzuEOsrb6uop8GxHg4YfEo6Nm9y1KlwxjTu7Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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