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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4dcdb28c0c586f8bcadcca5267cf4df3746abbe7fa2f7efe5e437fea99d4693' 
  AND token = 'RA9+bKplE3rNAWeMo8oNR+IKxY8Ueev4aW1TrPjTm3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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