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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7068484f29973950c7a95bce1ddeb3baf00c7dd66bacee1f91312c0ffa62d839' 
  AND token = 'PJ/hRt/INwAyZoHhEf5JB1uPvesUhjToZhMNi6e1ggc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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