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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '989b484d3bdbf1cc73e9dafca2d6aa54d10132af32b4d96afb2ce116a1ac6fee' 
  AND token = 'ITeaYSUKK7hZDRq87kZr2X74bGAAX6ElH9wvFvYdMoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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