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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7499b8447fa3501da49699b9f55e9fb212ae6102ed9b96ab8518d81f630fb958' 
  AND token = 'bzwAJ7vmCUudiLMlgHMOabm0mVhbaku4HmjRA0EWEtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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