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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '190b84fda2010af802186747917e101552c293b6a56845264b36cf72820e878f' 
  AND token = '4meZMHqu4GZSxWfZw47BFB6CHDUZ5o6Wl0Rm2tQII7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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