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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd87dad80cfed8e7666685a16b98876d758e9c6cf8152113a4b3621178abc14ca' 
  AND token = '17BRreBL7e/HN9edmJ35LTweT6W98ZCmj7ssgqVRJfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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