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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd10595ba3b89caba7adef85fa0852622a28f6d728cc574eac4d735634146496' 
  AND token = 'xT2CRAmn56JEONJ+g3FVmAowku3mLSAms7ixuI+ZsgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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