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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d3981047c59dcbb10bde0cb6e0afcc896be4dae53ea1b8b33b2c53f39c39dfd' 
  AND token = 'cAl6kYn3Vi2zAo0EiYc5GdRqRrQibDLRtDYb6c7hwVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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