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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f30036dd43af2c5439b40786483a304e3df3484a071a1f71a2690f8e38bcb1bf' 
  AND token = '9Kd8Hbr43WraHB0f3kAyd5jEODT+YO1FdoyEamfYkok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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