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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c20d559f0ba777f015c3ad532ed84bd8cd4b00db0aa5c879c3ed4b71a6e8f517' 
  AND token = 'VKNvlrpAqaEPt9W3VulvWSSWKI8jqWCgjoRb+lCLdAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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