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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91e7c440130abf13eda2748672ab8ac37bce5ca1a996c588b0ef94d06dba0e86' 
  AND token = 'jxQYgrwlp1QzR8wke6QrzYMROj2TyD7yuNtjzljozXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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