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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '731f7db0eef66df4107d7dd08c4712472ac4adfb49e12fec01b4c0e849701632' 
  AND token = 'Ra4hLRg2vEx129qHsGyFmD50+3aLy3BRRysU4a05p1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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