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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023da79982853486fa2c7d5121d03ae1d4a99f2de73b7a6b41259d283bf59f00' 
  AND token = '4ww9nAReReMtBUkqDDiKbchKCngefk3YSNUzuKkPSAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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