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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67f433fdc378ab1c97da4f8da3c7b3db8dd316b33253ad3a8339a7652710e88' 
  AND token = 'vi9eaA+3vTiOJAkunBSqcgMeBkUPm4AXK6mhsWJffZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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