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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e204bbc6b92868c2473c8950520bd10a62dd29d5c636d1095cf282e92a0f4192' 
  AND token = '3zqRBbaSIF1wYv4++ubdZgd73RCtuHcyY8jD+CdtyTk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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