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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1309c9a8556ee93fb3f8a7b7c7b53ae6b59fc1a519900cb6fcc6c9b72dd019b2' 
  AND token = 'USrbAoqIdXj76AcuOEsZEin2ySxZN8N2p/I+g5SB3Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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