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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13613d959852461cb85b8d1af54885469f22db99d7eff1924b790bf13dac29b5' 
  AND token = 'LH8ofd4mfv4qoKXx5bNfbcO63D/m3FpsrhOPnnLz5/0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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