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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd58cee3a47c9d311f5bf22e568c99fef4e8b89c229784b15d2e9c12ef0c184e' 
  AND token = '6YV2dy1sW/+E5KkQINLeHLwY2fgNTocTrDIlzaayeZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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