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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '252449e06a0e6ad1ef91f48af0e277d9ae1ed3f0f002c44363cecd4494176b2b' 
  AND token = 'WgFbN8duZboB9JvlT4782tJZrxclbbqsONmve8TmBdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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