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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e5fab2c72aea639a9128eda5dd0d459a8e7b91a6b600197108cdfd3892e69be' 
  AND token = 'nqab28cvkOUYVE2eG44um6n9d/ycoMyp4GABHbqnWrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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