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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99af15e0e74f39ef7c01313add1591df5fae0a8e2e74c2812a5e8c41abf21ade' 
  AND token = 'y6li1tAygKLCfm/3z+ASvF8+2Uq605zDDqxaAN9oMfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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