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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '18e5d552fbf73f9917eaf03a24139b7b9ba844144b9070749881817cbc56ce80' 
  AND token = 'wMz+74u0VN48CziJlEK7JQ/aEsy0Uuts+5qqW0nNWK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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