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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305d6c35fa1d88cb7189dc17514d4adc10c4182dcb2ef70fac263c4d36d239ad' 
  AND token = 'kq/V98fyhiIEydRQYSkWswgCwm1tCd99mpFYo/JnTrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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