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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4b61242923bf830c5edb6fadb8dac02726aaec798d29dbf29159721ae130a17' 
  AND token = 'RsMC9hKL+h3usfiQ2a04FJUeEOskIm6VaW1XdHAptO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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