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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb958c1e178ba285122775263e3582db386496623a6f551bac52d912ba0d6d9b' 
  AND token = 'j77yPlq8hmgyZ9IU1dIx8XF+phA5jH8236pHtrEAwuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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