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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3858905e2005c6e5ad84698c54478e5e23554b9ed591d855bd5473385693b6c1' 
  AND token = '8DrBHyKlWiUOgVXylER4ksnapUmYrWp10oJCkf+DYr4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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