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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '008ba83d097c44da6b308729c5a8702e231b5109d68cd0ceba9e11e36951796e' 
  AND token = 'Vhh6ZVbJYyVftGnI3rTrp0d3CQU18jx1mjWAP+0jFXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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