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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5dfb639f3e8cbc59dcb591e45aad213cfcdfdd80971756d319dd0ef1ff78c6f8' 
  AND token = 'noZndsz0MZyJLyUutKjbymp2KC2v6yHG8IeSdjJXf1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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