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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3377846ca40fea193e99a6b375f4d46efaed409d52c5f90def8153b582b0b9' 
  AND token = 'nJfI8ND+g7VB/h4S4DRz81viALn0uYXxiyFWXBx26yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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